Xbox 360 SMC Error: 0020
ERROR_GPU_RST_DONE
GPU_RST_DONE signal missing after seqUnReset time passed
This means the GPU did not assert the GPU_RST_DONE signal within the allotted time
- GPU Reset Done
- This signal must be checked quickly, immediately after powering on
- Check if GPU_RST_DONE is high (3.3V):
- Phat: FT2P13
- Trinity: FT3R16
- Corona/Winchester: FT3T2
- If signal is missing, proceed to the next step
- Check 1K Ohm resistor:
- Phat: R2P15
- Trinity: R3R19
- Corona/Winchester: R3E6
- Check 10K Ohm pull-down resistor:
- Phat: R2P10
- Trinity: R3R20
- Corona/Winchester: R3E7
- If the signal is present, resistors are ok, but this error persists, replace Southbridge:
- Phat: U2C1
- Slim: U3D1
- GPU Reset
- GPU_RST_N must go high in order for the GPU to run
- It is controlled by the Southbridge
- Check that GPU_RST_N goes high (1.2-1.8V):
- Phat: FT2P14
- Slim: FT3R17
- If missing signal, replace Southbridge:
- Phat: U2C1
- Slim: U3D1
- GPU Clock
- Check junction between the sets of 33 and 49.9 Ohm resistors for proper 100 MHz differential clock
- If bad/missing signal, check the values of the resistors as follows:
- Phat:
- Check R3C7 and R3C8: 33 Ohms
- Check R3C15 and R3C16: 49.9 Ohms
- Trinity:
- Check R3C3 and R3C4: 33 Ohms
- Check R3C7 and R3C8: 49.9 Ohms
- Corona/Winchester:
- Check R3D10 and R3D12: 33 Ohms
- Check R3D11 and R3D13: 49.9 Ohms
- If still bad/missing clock signal, replace clockgen chip:
- Xenon: Cypress CY28517 U3B4
- Zephyr, Falcon, Jasper: HANA U4C2
- Trinity: HANA U3B1
- Corona/Winchester: Southbridge U3D1
- GPU
- If all else fails, GPU is bad and must be replaced:
- Phat: U4D1
- Slim: U5E1